package com.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import com.beans.AdminInfo;

/*
 * session过滤器
 */
public class SessionFilter implements Filter {
	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest req=(HttpServletRequest)request;
		
		HttpSession session =req.getSession();
		AdminInfo admin=(AdminInfo)session.getAttribute("session_admin");
		if(admin!=null) {
			chain.doFilter(request, response);
		}
		else {
			request.getRequestDispatcher("/login.jsp").forward(request, response);
		}
		
	}

	public void init(FilterConfig filterConfig) throws ServletException {				
	}



}
